package com.sky.aspect;
import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDate;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){ }
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共字段自动填充...");
        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//获取方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取注解对象
        OperationType operationType = autoFill.value(); //获取数据库操作类型
        //获取当前被拦截方法的参数 --实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null ||args.length == 0 ) {
            return;
        }
        Object entity = args[0];
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        switch (operationType) {
            case INSERT:
                try {
                    Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                    Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                    Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                    Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                    //反射赋值
                    setCreateTime.invoke(entity, now);
                    setCreateUser.invoke(entity, currentId);
                    setUpdateTime.invoke(entity, now);
                    setUpdateUser.invoke(entity, currentId);
                }catch (Exception e){
                    log.error("公共字段填充失败: {}", e.getMessage());
                }
                break;

            case UPDATE:
                try {
                    Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                    Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                    //反射赋值
                    setUpdateTime.invoke(entity, now);
                    setUpdateUser.invoke(entity, currentId);
                }catch (Exception e){
                    log.error("公共字段填充失败: {}", e.getMessage());
                }
                break;
            default:
                break;
        }
    }
}
